Complete prepared presentation build and runtime integration

src/capability-model/types.ts

@@ -322,6 +322,9 @@ export interface WorkspacePresentation {
 }
 
 export interface PackageRevision {
+  /** Explicit build consumers own these artifacts. Generic checking and query
+   * execution attach no semantics to their keys or contents. */
+  buildArtifacts?: Record<string, unknown>;
   modules?: PackageModule[];
   /** Closed interface imports exposed to this package's checked component bindings. */
   clientInterfaces?: Record<string, InterfaceRevisionId>;